jayzhan211 commented on code in PR #13756:
URL: https://github.com/apache/datafusion/pull/13756#discussion_r1884703980


##########
datafusion/functions-nested/src/extract.rs:
##########
@@ -993,3 +993,84 @@ where
     let data = mutable.freeze();
     Ok(arrow::array::make_array(data))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::array_element_udf;
+    use arrow_schema::{DataType, Field};
+    use datafusion_common::{Column, DFSchema, ScalarValue};
+    use datafusion_expr::expr::ScalarFunction;
+    use datafusion_expr::{cast, Expr, ExprSchemable};
+    use std::collections::HashMap;
+
+    #[test]
+    fn test_array_element_return_type() {
+        let complex_type = DataType::FixedSizeList(

Review Comment:
   > It doesn't seem right to me that ExprSchema is coercing the arguments 
(implicitly) to me 🤔
   
   We need to get the `return_type` of the function here and the arguments of 
`return_type` is the "coerced data type" therefore I think `new_data_types` is 
the right choice to me.



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